Opi "Teenage Dream" is from Katy Perry collection and it is slightly pink-based and sparkly. It is really hard to remove it and I'm pretty sure that it harms the nail when you remove it because I saw some scratches on my nail after removing it. It is not a unique colour either. I put "Moon Over Mumbai" under it as base colour. Because it is really hard to take it off, it is a colour to use once in a year for me..